A Method and Device for Determining Single Width Sediment Delivery Rate of Drain Channel and Forebay of Pumping Station

Abstract

The embodiment of the present invention provides a method and device for determining the single-width sediment delivery rate of the diversion channel and forebay of the pumping station. diameter, the ratio of sediment to water density and the kinematic viscosity coefficient of water; obtain the Shields number and the friction factor of the reciprocating flow sandy bed surface; based on all the above parameters, and analyze the boundary layer asymmetry of the moving bed surface , to obtain the erosion depth and boundary layer thickness to obtain the instantaneous single-width sediment delivery rate in volumetric flow under reciprocating flow conditions. The embodiments of the present invention carry out design and calculation through the determined boundary layer thickness of the relevant moving bed surface and phase difference parameters, reflecting the phase residue of the sediment transport rate after the flow velocity is reduced and the phase drift relative to the flow velocity, given the instantaneous sediment transport rate and flow velocity The relationship between the number of times and the judgment of the negative net sediment transport caused by the large phase difference in the asymmetric flow.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of water conservancy engineering, and in particular to a method and a device for determining the single-width sediment delivery rate of a pumping station diversion canal and a forebay. Background technique [0002] In the reciprocating flow of the diversion channel of the pumping station and the sandy bed surface of the forebay, the single-width sediment transport rate is dynamically changed. The instantaneous single-width sediment transport rate widely used in engineering is derived based on the theory of constant flow, which fails to reflect the asymmetric development and phase difference of the reciprocating flow boundary layer. [0003] This leads to its disadvantages: it cannot reflect the phase drift and phase residue of the sediment delivery rate relative to the flow velocity, and cannot give the relationship between the instantaneous sediment delivery rate and the flow veloc...

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Problems solved by technology

[0003] This leads to its disadvantages: it cannot reflect the phase drift and phase residue of the sediment delivery rate relative to the flow velocity, and cannot give the relationship between the instantaneous sediment delivery rate and the flow velocity times, and is not suitable for the negative net sediment delivery caused by the large phase difference in the asymmetric flow. situation

But so far, how to give the instantaneous single-width sediment delivery rate of the pumping station diversion channel and the sandy bed surface of the forebay under the condition of reciprocating flow, there are no achievements and methods for reference

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